It's definitely more aggressive than a full table, but I'm more of an opportunist HU than a thief/bully. I wait for people to stick their necks out.
In the HU games I play ($10 and lower) people are pretty easy to read so I prefer getting in cheap and outplaying them post flop.
You can see patterns in their betting. When they suddenly bet more, they have a hand and you can fold your non-premium hands.
I am perfectly fine folding top pair in a HU game if I read the guy as strong.
As far as strategy goes, if I'm on the button I'm a *lot* more likely to raise, especially early when the blinds are cheap. I'm raising most hands on the button early on when the blinds are cheap. It's cheap so I can fold my junky hands when challenged, and I'm training them to think that I'm aggressive and probably raise with any two cards.
As the blinds go up I raise substantially less. By then I should have a pretty good idea of how they play, and I can afford to get trappier. I'll even check/call with Ace/King because they don't put me on an Ace (because "everyone" raises with an Ace HU). I've stacked more than one player who's flopped second pair, and shoved because they assumed I couldn't have had the Ace.